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On March 20, 2020, three days before the first UK lockdown, Tim Spector realized that the country was in desperate need ofa Covid tracking app. Spector, a professor of genetic epidemiology at King's College London, was in an unusually good position to launch exactly that kind of app. He was one of the cofounders of Zoe, a personalized nutrition startup that had Just developed a diet-tracking app where people could report what they'd been eating over the past two weeks and receive a personalized food health score. The diettracking app was still in beta testing, but Spector figured that asking people to report their Covid19 symptoms wasn't too different from getting them to report their meals. Armed with daily symptom information, the Zoe team could help pinpoint new outbreaks at a time when Covid19 tests were in extremely limited supply. After five days of frantic development, the lCovid Symptom Tracker was live. Within another 10 days it had 2 million downloads. Over the pandemic, some 4.? million people downloaded the app to report their test results and whether they had Covid19 symptoms or not. r"It was a leap of faith,\" says Spector. At its peak, 2.4 million people tracked their symptoms using the Covid Symptom Tracker. It was one ofthree surveillance studies the UK government used to track and respond to new outbreaks. Data from the tracker led to the UK government adding loss of smell and taste to the official list of Covid-19 symptoms. Between August 2020 and March 2022, the app was funded with 51 million [86.2 million} from the Department of Health and Social Care. Based on your understanding, what would be the most appropriate systemsbuilding method for Zoe? is the systems-building method for Zoe similarto the disease surveillance analytic program that they developed later? Why? {4 Marks]